What is the suction temperature used for theoretical discharge calculations?

The suction temperature used for theoretical discharge calculations is significant because it affects the thermodynamic properties of the refrigerant and determines the efficiency of the refrigeration cycle. When calculating the theoretical discharge pressure and the enthalpy at the compressor discharge, the suction temperature provides a baseline to assess how the refrigerant behaves as it is compressed.

A suction temperature of 26°F is often chosen for theoretical discharge calculations because it is within a common operational range for many industrial refrigeration systems. This temperature allows for realistic calculations that reflect the actual conditions under which many refrigeration systems operate. In practical applications, using this temperature can help ensure that the calculations provide an accurate understanding of performance and efficiency.

Other temperatures, although possible under certain operational conditions, might not be as commonly used for general theoretical calculations. For example, 19°F or 24°F might be used in specific scenarios but do not represent the mid-range temperatures typical in broader calculations for various refrigeration applications. On the other hand, 30°F may be too high for many systems, as this tends to be closer to the operational limits of some refrigerants, leading to less favorable discharge conditions. Thus, the choice of 26°F aligns well with standard practices in industrial refrigeration.